[swift-evolution] [Pitch] Remove type-inference for stored property

[Goffredo Marocchi]

We currently pay a dear cost in compilation time for all the features Swift brings and this in itself harm productivity quite a bit, the gulf between Swift and Objective-C projects compile time wise is massive and right nowt seems like we are ignoring it sometimes. Type inference can be a non trivial component of that and while it is a wow factor feature initially, it has never been clear as a practical big win when code being self documenting and easy to debug and maintain is concerned... 

Sent from my iPhone

> On 11 Apr 2017, at 00:26, David Beck via swift-evolution <swift-evolution at swift.org> wrote:
> 
> This seems like something a linter should handle.
> 
> > Hi all,
> > 
> > In a discussion about inferring parameter types from default value, Slava brought up some performance problems caused by type inference for stored properties in side types:
> > 
> > https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170313/033882.html
> > 
> > Towards the end, the post mentioned that some Swift team members contemplated requiring types for stored properties in type declarations. I think this idea deserves some more attention. Hence this last minute idea-floating.
> > 
> > In addition to solving a performance headache in implementation, there're always the general benefit of making type declartion more explicit and readable (clarity for reader should out-weigh pleasure of the author). Making the
> > language slightly more consistent (we are not inferring types for default parameter values in function anyways).
> > 
> > The cons for doing this are obvious too: the inference makes the language feels more friendly and is, undoubtedly, a beloved feature for many. This would be a source breaking change.
> > 
> > Just thought I'd float the idea to gather some quick reaction. What do y'all think?
> > 
> > Daniel Duan
> > 
> > 
> >  
> 
> 
> David Beck
> http://davidbeck.co
> http://twitter.com/davbeck
> http://facebook.com/davbeck
> 
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